Tube for tubular lanterns.



E. C. EVERETT.

TUBE FOR TUBULAR LANTERNS. APPLICATION man AUG. 12. 1915.

Patented Oct. 24, 1916.

IUITTTED @TATEE PATET UT T TEE,

ERNEST G. EVERETT, OF NEW YORK, N. Y., ASSIGNOR TO B. E. DIETZ COMPANY,OF NEW YORK, N. Y.

TUBE FOB TUBULAR LANTERNS. I

raoaeee.

Specification of Letters Patent.

Patented Uct. 2411, 191 5.

Application filed August 12, 1915. Serial No. 45,155.

To all whom it may concern:

Be it known that I, ERNEST C. EVERETT,

a citizen of the United States, residing at New York, in the county ofNew York and State of New York, have invented a new and usefulImprovement in Tubes for Tubular Lanterns, of which the following is aspecification.

This invention relates to the construction of frame tubes for tubularlanterns and particularly to that class of lantern frame tubes whichhave bent ends for connection with the upper and lower portions of thelantern frame and are composed of two stamped half tubes or sections,each of which is of half round cross-section, and which are securedtogether by interlocking flanges or seams extending along the meetingedges of the half tubes. Unless provision is made for preventing thetube-halves from shifting lengthwise one on the other the tubes will notbe rigid but can be easily twisted so that the bent ends will not lie inthe same plane, and heretofore in the manufacture of tubular lanternframes considerable difficulty has been experienced in keeping the bentends of the tubes parallel. If the tubes are twisted ever so slightly.the ends thereof will be thrown out of the intended position and thelantern frame when assembled will be faulty in construction, whereas thetwisting can be prevented and tubes made strong and rigid by securingthe tube halves in such a way as to prevent such relative shifting.

The present invention has for its object to provide an inexpensive andeffective construction of the tubes by means of which the twistingthereof is entirely prevented and the tubes are made strong and rigid,and no soldering or tacking of the tube seams is necessary. I

In the accompanying drawings: Figure 1 is a fragmentary front elevationof a tubular lantern frame, the side tube of which embodies theinvention. Fig. 2 is a side elevation of the lantern tube on an enlargedscale. Fig. 3 is a cross section of the lantern tube taken on line 33,Fig. 2.

1 represents one of the air tubes of a tubular lantern of ordinaryconstruction having air tubes at opposite sides thereof connecting theair chamber 2 on the oil pot with the air chamber 3 or chimney at thetop of the lantern. Each air tube consists, as usual, of two sections orhalf-tubes of half round cross-section connected by seams l and 5extending along the meeting edges of the sections at the inner and outersides of the tube and formed by edge flanges on one tube section foldedover edge flanges on the other tube section. These seams securely unitethe two tube sections but do not positively prevent one section fromshifting lengthwise relative to the other sufliciently to permit thetwisting of the tube. In order to pre vent such shifting of the tubesections each of the seams 4 and 5 is indented, bent or kinkedtransversely in one or more. places, indicated at 6. so as to forminterlocking projections and indentations in the flanges that form theseam. These indentations or bends serve to hold the tube sectionsrigidly against relative longitudinal movement and positively preventthe tube from twisting, making the tube very strong and rigid. Theindentations or bends are exaggerated in the drawings. In practice theyare very small and hardly noticeable and do not detract from theappearance of the tube. They can be formed by suitable means in suchmanner that they do not appreciably add to the expense of manufacture ofthe tubes and therefore constitute a thoroughly practical andinexpensive means for the intended purpose.

I claim as my invention:

1. A tube for tubular lanterns composed of two tube sections joined byinterlocked seam flanges extending along their meeting edges atopposite. sides of the tube. said seam flanges being provided atintervals with interlocking bends which prevent relative longitudinalshifting of said sections.

2. A tube for tubular lanterns having two bent ends and composed of tubesections joined by interlocked seam flanges extending lengthwise at theinner and outer sides of the tube, the seam flanges of one tube sectionbeing provided with projections which fit in depressions in the seamflanges of the other tube section and prevent the tube from twisting.

3. A 'tube for tubular lanterns composed Witness my hand, this 9th dayof August,

of tube sections joined by interlocked seam 1915. flanges extendlngalone; then lneetlng edges,

5 laterally between their ends to form inter- \Vitnesses:

locklng portlons Whlch prevent relatlve lon- ROBERT A. CURRIE,,Q'ltlldlllfll shlftlng' of 'sald sectlons. W. VAN DUYN.

Copies of this patent may be obtained for five cents each, by addressingthe "Commissioner of Patents.

' Washington, D. C.

